In North America, the most prestigious competition in mathematics at the undergraduate level is the William Lowell Putnam Mathematical Competition. This volume is a handy compilation of 100 practice problems, hints, and solutions indispensable for students preparing for the Putnam and other undergraduate mathematical competitions. Indeed, it will be of use to anyone engaged in the posing and solving of mathematical problems.
Many of the problems in this book were suggested by ideas originating in a variety of sources, including Crux Mathematicorum, Mathematics Magazine, and the American Mathematical Monthly, as well as various mathematical competitions. This result is a rich selection of carefully chosen problems that will challenge and stimulate mathematical problem-solvers at varying degrees of proficiency.
Kenneth Williams and Kenneth Hardy split "The Red Book of Mathematical Problems" into three sections. The first section introduces the problems, the middle portion contains hints to solve the problems, and the final section contains the complete solution to each problem.
The final section is much longer because it goes in-depth into each problem.
The book is sufficient for its purpose. I don't have any issues with it.